Per Wikipedia, Godwin's Law states that, "As an online discussion grows longer, the probability of a comparison involving Nazism or Hitler approaches 1." (See also Reductio ad Hitlerum.)

Without using either term, Steven Hayward at the PowerLine blog points out an example among the WikiLeaks emails whose release has so enlivened the Democratic National Committee's day:

Presumably at least the DNC's "T. Helmstetter" [email him] would be similarly horrified to be tipped off about the National Question, which Peter Brimelow has defined as, "[W]hether the U.S. can continue as a nation-state, the political expression of a specific people".